1. These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 19, 2010.

2. This transaction was executed in multiple trades at prices ranging from $380.88 to $381.81; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

3. This transaction was executed in multiple trades at prices ranging from $381.88 to $382.80; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

4. This transaction was executed in multiple trades at prices ranging from $383.42 to $384.33; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

5. This transaction was executed in multiple trades at prices ranging from $384.44 to $385.12; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

6. This transaction was executed in multiple trades at prices ranging from $385.74 to $386.32; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

7. This option was granted on August 30, 2005 and vested in 16 quarterly installments over the four-year period after the date of grant.

/s/ Gene Levoff, Attorney-in-fact for Jeffrey E. Williams

09/02/2011

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).